通过向垂直放有铜片的烧杯中滴加 AgNO 3溶液,在铜片上制备出水接触角从平整铜表面的90．8°升至151．4°的梯度润湿表面；结合前期以碱辅助氧化法制备亲水区间的梯度润湿表面,实现了在无低表面能物质修饰时,构建从超疏水(151．6°)至超亲水(3．7°)的高梯度润湿铜表面.制得的润湿性梯度在近100℃的水浴中浸泡10 h,各点的接触角变化最大不超过10°.采用扫描电镜(SEM)和 X 射线衍射(XRD)等对样品表面形貌演变和结构进行分析,表明在铜表面分别沉积具有相对疏水的银粒子和亲水特性的氢氧化铜粒子,并形成合理的粗糙结构,可使铜片分别达到超疏水和超亲水状态,从而形成高梯度润湿铜表面.由于平整的银表面和氢氧化铜表面的水接触角分别为72．8和62°,这也从另一侧面说明亲水与疏水的界限在65°可能更加合理.
Gradient wettability surface changing from the original contact angle of copper (90.8°)to surperhy-drophobic (15 1.4°)was prepared on copper substrate via a facile chemical displacement technique,by adding dropwise AgNO 3 solution into a beaker with copper foil vertically placed inside.By combining with the previous-ly reported alkali-assistant-oxidation technique for creating hydrophilic wettability gradient,the high wettability gradient surface from 15 1.6 to 3.7°was further fabricated on the copper substrate.The copper foil may keep its gradient wettability property after immersed in water bath around 100 ℃ for 10 h,with a maximum change of contact angle less than 10°.The scanning electron microscopy (SEM),X-ray diffraction (XRD)and surface to-pography instrument (3D)were employed to analyze the morphologies evolution and crystal structures of the silver nanoparticles on copper substrate.The results show that the high gradient wettability surface from super-hydrophilic to superhydrophobic may be constructed by depositing the hydrophilic copper hydroxide particles and relatively hydrophobic silver particles,respectively,in both end parts of the copper foil and in turn forming gradient roughness structures.As the water contact angle of flat silver surface and smooth surface of copper hy-droxide are 72.8 and 62°respectively,the results found in this paper may suggest another example for defining hydrophobicity and hydrophilicity by a critical contact angle of 65°.
参考文献
| [1] | Chaudhury M K;Whitesides G M .How to make water run uphill[J].SCIENCE,1992,256(5063):1539-1541. |
| [2] | 张勇,皮丕辉,文秀芳,郑大锋,蔡智奇,程江.梯度接触角表面的构建与应用[J].化学进展,2011(12):2457-2465. |
| [3] | Zhi Huang;Yuxuan Lu;Hanshi Qin;Bing Yang;Xuejiao Hu .Rapid Synthesis of Wettability Gradient on Copper for Improved Drop-Wise Condensation[J].Advanced Engineering Materials,2012(7):491-496. |
| [4] | Hu Yanxin;Cheng Jiang;Zhang Wei et al.Thermal per-formance enhancement of grooved heat pipes with inner surface treatment[J].International Journal of Heat and Mass Transfer,2013,67(1):416-420. |
| [5] | Ju Jie;Xiao Kai;Yao Xi et al.Bioinspired conical copper wire with gradient wettability for continuous and efficient fog collection[J].Advanced Materials,2013,25(1):5937-5940. |
| [6] | Huang Dingjun;Leu Tzongshyng .Fabrication of high wettability gradient on copper substrate[J].Applied Sur-face Science,2013,280(1):25-28. |
| [7] | Huang Ziheng;Zhang Jiaoru;Cheng Jiang et al.Prepara-tion and characterization of gradient wettability surface depending on controlling Cu(OH)2 nanoribbon arrays growth on copper substrates[J].Applied Surface Sci-ence,2012,259(1):142-143. |
| [8] | Wang Shutao;Feng Lin;Liu Huan et al.Manipulation of surface wettability between superhydrophobicity and su-perhydrophilicity on copper films[J].Chem Phys Chem,2005,6(1):1475-1480. |
| [9] | 李恒达,刘心中,甘永江,郑志功.肉豆蔻酸铜超疏水表面化学结构及其性能分析[J].功能材料,2014(09):9080-9083. |
| [10] | 裴明德,王波,张丽霞,汤云辉,严辉.铜表面的纳米结构制备及其浸润性研究[J].功能材料,2013(20):2940-2944. |
| [11] | 乔卫,朱定一,温鸿英,王尤生,廖琳.金属表面超疏水性的研究进展[J].材料导报,2009(19):45-49,56. |
| [12] | 杜晨光,夏帆,王树涛,王京霞,宋延林,江雷.仿生智能浸润性表面研究的新进展[J].高等学校化学学报,2010(03):421-431. |
| [13] | Linghao Kong;Xinhua Chen;Guangbin Yang;Laigui Yu;Pingyu Zhang .Preparation and characterization of slice-like Cu_2(OH)_3NO_3 superhydrophobic structure on copper foil[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2008(22):7255-7258. |
| [14] | Herminghaus S. .Roughness-induced non-wetting[J].EPL,2000(2):165-170. |
| [15] | Lin Feng;Yanlin Song;Jin Zhai;Biqian Liu;Jian Xu;Lei Jiang;Daoben Zhu .Creation of a Superhydrophobic Surface from an Amphiphilic Polymer[J].Angewandte Chemie International Edition,2003(7):800-802. |
| [16] | Guo Chaowei;Wang Shutao;Liu Huan et al.Wettabili-ty alteration of polymer surfaces produced by scraping[J].Journal of Adhesion Science and Technology,2008,22(4):395-400. |
| [17] | Yoon R H;Flinn D H;Rabinovich Y I .Hydrophobic in-teractions between dissimilar surfaces[J].Journal of Colloid and Interface Science,1997,185(2):363-364. |
| [18] | Song W;Zhang JJ;Xie YF;Cong Q;Zhao B .Large-area unmodified superhydrophobic copper substrate can be prepared by an electroless replacement deposition[J].Journal of Colloid and Interface Science,2009(1):208-211. |
| [19] | 周亚丽,李梅.利用银镜反应制备梯度润湿性表面[J].材料导报,2009(08):21-23,30. |
| [20] | Wu XF;Shi GQ .Production and characterization of stable superhydrophobic surfaces based on copper hydroxide nanoneedles mimicking the legs of water striders[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2006(23):11247-11252. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%